The report presents a recommendation of a system design for a worldwide seismic data network. Particular attention has been paid to recent or imminent developments in the areas of digital communication, processing, and storage. Both sensor stations currently expected to be operational about 1975 and possible future expansion or modification of the network are considered. The major conclusions of the system design are (1) seismic event detection should be done at the array site in the majority of cases, (2) the ARPANET is generally a suitable and cost effective communication facility for seismic data transmission, (3) a communications control center should be established at SDAC in order to coordinate and monitor the seismic data network operation centrally, (4) network event processing can evolve from the existing large array event processing system at SDAC, (5) long period event processing should be done off- line using ARPANET computing resources with special consideration given to eventual use of the ILLIAC IV array processor, and (6) the Datacomputer service can provide an appropriate data management system for the seismic data network.

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